I think an automated misting system would by ideal. Is that not an option? When I go on short vacations, two-three days at most, my chameleons is set once I have fed her the day of our departure and her mister is turned on for the whole vacation, and then once I get back I feed her and she is totally unaffected. When I go on longer vacations, I fill the mister up all the way and then have someone come in and feed her if needed in the middle. I know chain pet stores like PetCo and PetSmart carry the cheaper misting systems, like the Monsoon, which I have used without any trouble. You could probably upgrade once you get back but I think it would suffice for the weekend, no?